초록 ▼

Pressure sensing device having a housing (12) with a bottom wall (14) and interior surface (16) and having upstanding edge wall (18) around the periphery of said housing (12). A layer (22) supports a pressure sensing element (30) and its circuitry. A porous gas permeable support layer (40) overlies

Pressure sensing device having a housing (12) with a bottom wall (14) and interior surface (16) and having upstanding edge wall (18) around the periphery of said housing (12). A layer (22) supports a pressure sensing element (30) and its circuitry. A porous gas permeable support layer (40) overlies said pressure sensing element (30) and includes a gas chamber (42) adjacent to the pressure sensing element (30). A gas permeable membrane (50) is supported on said support layer (40). The elements are sealed with respect to the housing as is wire or cable (32) leading from the pressure sensing element (30) to instrumentation remote from the sensing device for readout of measurements by the sensor device (10).

대표청구항 ▼

An improved sensor device for measuring total dissolved gas and liquid vapor, comprising: a) a water proof housing of predetermined shape which supports a pressure sensitive wafer means, b) pressure sensitive wafer means including integrated circuitry for required signal supported in said housing an

An improved sensor device for measuring total dissolved gas and liquid vapor, comprising: a) a water proof housing of predetermined shape which supports a pressure sensitive wafer means, b) pressure sensitive wafer means including integrated circuitry for required signal supported in said housing and including mounting means for mechanical support and a pressure sensor supported on said mounting means, said pressure sensor being connected by connecting wire means for transmitting signal extending through said housing in sealed relationship thereto to an instrument and instrument readout means for indicating total dissolved gas and liquid vapor pressure, c) a gas porous, mechanically rigid membrane support layer, said membrane support layer overlying and being integrated with said pressure sensitive wafer means including a gas chamber of predetermined minimum volume adjacent said pressure sensitive wafer means such that said pressure sensitive wafer means is spaced from direct contact with said membrane support layer to assure that only gas pressure is sensed by said pressure sensor, d) gas permeable membrane means supported on and by said gas porous membrane support layer such that dissolved gas and liquid vapor of a liquid diffuse through said gas permeable membrane means into said porous membrane support layer and into said gas chamber so that gas pressure in said porous membrane support layer reflects the total gas and liquid vapor pressure in the liquid and is sensed by said pressure sensor, e) said pressure sensitive wafer means, said porous membrane support layer, and said gas permeable membrane means being liquid sealed with respect to said housing to that liquid in which the sensor device is being used is prevented from entering said device, whereby only dissolved gas and liquid vapor diffusing through said gas permeable membrane means are sensed by said pressure sensor and a signal is generated by said integrated circuitry and transmitted to said readout means remote from said pressure sensitive wafer means.